The pair were ringside to take in Tyson Fury's fight against Francesco Pianeta but stole the show of the undercard with their amusing 'bout'.
Gazza took on the American boxer and hit him with a series of cheeky digs, connecting with a right and left hook, before landing a friendly kiss on his cheek.
The pair laughed and joked together before shaking hands and enjoying a warm embrace.
Wilder had previously had beer thrown at him at Windsor Park after the controversial world champion squared up to Fury at the weigh-in.
He was also involved in chaos in Belfast last night after Billy Joe Saunder's launched half a chicken at him in a Nando's.
The 32-year-old, though, said he is in Belfast to try and secure a deal for a bout with Fury.
But he added he was also there to see Carl Frampton in action and has loved the welcome he has received from the Northern Irish public.
Wilder said: "What brings me here is I'm trying to get a fight sorted with Fury. I'm gonna knock him out.
"I've got nothing but love from Belfast. It's always amazing [in the UK]. I've always said you guys have some of the best fans in the world and you always prove me right. I've got nothing but love, I love coming here!"
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